Because it feels like it.
A carrot will float in salt water because salt water is denser than the carrot. This creates buoyant force that allows the carrot to float. In fresh water, the carrot is denser than the water, causing it to sink.
Carrot cells placed in salt water will lose water due to osmosis, causing them to shrink and become wilted. The high concentration of salt in the water creates a hypertonic environment, leading to water leaving the carrot cells to try to balance the salt concentration.
Water moves out of the carrot's cells and into the salt water due the difference in concentration of NaCl. This might account for the spongy-ness of the carrot
If a lot of salt has been added (which I assume is the intention of this question), then the carrot cubes will shrink because the solution will be hypertonic to the carrot cubes. However, adding just the right amount of salt or too little salt can result in the carrot cube staying the same or bloating, respectively.
Water moves out of the carrot's cells and into the salt water due the difference in concentration of NaCl. This might account for the spongy-ness of the carrot
Turgidity will decrease in salt water because water in the carrot will flow out in order to try to equalize the high concentration of salt.
This is due to the process of osmosis. The water in the cells of the carrot are trying to reach homeostasis with the salt water, so the water is flowing out of the cells. This results in cells that are limp and that then feel spongy.
there is more water but not in the carrot and it isn't all fresh water but there is more water than salt
Salt draws the water out of the carrot - causing it to be "mushy".
When placed in a concentrated salt solution, the carrot will lose water through the process of osmosis. This will cause the carrot to shrink and become limp as the water moves from an area of higher concentration (inside the carrot) to an area of lower concentration (the solution).
the more salt you add the more difficult it would be for the plant to get water.
The crystal is broken.